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Experimental and numerical analysis of steel pipes subjected to combined loads.

机译：钢管在组合载荷作用下的实验和数值分析。

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摘要

A review of previous experimental, analytical, and numerical research conducted on pipe segments subjected to combined loading indicate that very few tests were reported on (a) pipes subject to load combinations involving axial tension, internal pressure, and bending, and (b) tests involving combinations of torsion, internal pressure, and bending. Within this context, an experimental program consisting of two full-scale test series on a total of eight pipe specimens is conducted. The specimens were made of X65 material (Specified Minimum Yield Strength=448MPa) with 508mm outer diameter (OD), and a nominal diameter-to-thickness ratio (D/t) of 80. In the first test series, specimens were subjected to combinations of internal pressure, axial tension, and bending and were aimed at (a) quantify the beneficial effect of axial tension on the magnitude of critical buckling strains of pipes and (b) determine whether or not the pipes are able to attain their modified plastic moment resistance as predicted by analytically derived plastic interaction relations. In the second test series, pipe specimens were subjected to load combinations involving internal pressure, axial tension, torsion, shear, and bending and were aimed to measure the pipe modified moment capacity. The moment vs. curvature relations, peak moment values, and local buckling behavior of the specimens as obtained from the experiments are documented. The peak moments obtained are compared to the analytically predicted moments. A nonlinear shell finite element model is also developed using the Finite Element Analysis (FEA) simulator ABAQUS in order to predict the moment capacity, critical strains, and the local buckling behavior of pipe specimens. Test results were observed to compare very well with FEA predictions for the moment capacities and buckling modes. Under certain combinations of axial tension and internal pressure, experiments and FEA show that pipes with Dt=80 are able to attain their modified plastic moment resistances. The FEA predicted longitudinal compressive strains were fairly good, but less reliable than the FEA predicted moment resistances. After demonstrating the ability of the FEA to reliably predict pipe modified moment capacity in previous and current research programs, a systematic FEA parametric study is conducted to investigate the effect of geometric properties (D/t) and loading conditions (torsion, axial force, and internal pressure) on the ability of the pipes to develop their modified plastic moment capacity. As a result of this parametric study, it was observed that the ability of the pipes to develop their plastic moment capacity is strongly dependant on axial force and D/t ratio. On the other hand, internal pressure and torsion are relatively less effective on this ability.
机译：对先前在组合荷载作用下的管段进行的实验，分析和数值研究的回顾表明，很少有关于（a）承受轴向荷载，内压和弯曲的荷载组合的管道的测试报告，以及（b）试验涉及扭力，内部压力和弯曲的组合。在这种情况下，进行了一个实验程序，该程序由两个完整的测试系列组成，总共对八个管道样本进行了测试。样品由X65材料制成（指定最小屈服强度= 448MPa），外径（OD）为508mm，标称直径与厚度比（D / t）为80。在第一个测试系列中，对样品进行了内部压力，轴向张力和弯曲的组合，目的是（a）量化轴向张力对管道的临界屈曲应变幅度的有益影响，以及（b）确定管道是否能够获得其改性塑料由分析得出的塑性相互作用关系预测的抗弯矩。在第二个测试系列中，对管道试件施加了涉及内部压力，轴向张力，扭转，剪切和弯曲的载荷组合，目的是测量管道的修正弯矩承载力。从实验中获得的样本的弯矩与曲率关系，峰值弯矩值和局部屈曲行为均已记录在案。将获得的峰值矩与分析预测的矩进行比较。还使用有限元分析（FEA）仿真器ABAQUS开发了非线性壳有限元模型，以预测弯矩的承载能力，临界应变和管道试样的局部屈曲行为。观察到的测试结果可以很好地与FEA预测的弯矩能力和屈曲模式进行比较。在一定的轴向张力和内部压力组合下，实验和有限元分析表明，Dt = 80的管道能够达到其改进的塑性抗力矩性能。 FEA预测的纵向压缩应变相当好，但不如FEA预测的抗弯强度可靠。在先前和当前的研究程序中证明了FEA能够可靠地预测管道修正弯矩能力的能力之后，进行了系统的FEA参数研究，以研究几何特性（D / t）和载荷条件（扭转，轴向力和内部压力）对管道发展其改进的塑料弯矩能力的能力的影响。这项参数研究的结果是，观察到管道形成塑性力矩能力的能力在很大程度上取决于轴向力和D / t比。另一方面，内部压力和扭转对此功能的影响相对较小。

著录项

  • 作者

    Ozkan, Istemi F.;

  • 作者单位

    University of Ottawa (Canada).;

  • 授予单位 University of Ottawa (Canada).;
  • 学科 Engineering Civil.
  • 学位 Ph.D.
  • 年度 2008
  • 页码 193 p.
  • 总页数 193
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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